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Total nonbonded force (kcal/(mol Å)) on base G of the GC dimer with respect to the N-N distance (the distance between N-1 of guanine and N-3 of cytosine). The results of this work are shown in red triangle, and the results of the virtual work method are shown in blue star. The error bar means the standard error of the means. The data were collected with the grid spacings of 1/4 Å (top) and 1/16 Å (bottom).
